On twin Earths, many parallels existed. Two Supermen, two Batmen, two Wonder Women... exact cosmic twins. Such was the same for various other crusaders, such as the Blackhawks and Boy Commandos. While dozens of the Blackhawks' tales on both worlds has been revealed, hundreds of the tales in modern times seemingly still young on Earth-One exist, including when the Justice League inspired them into assumed costumed aliases.
Similarly, while there has been indirect records of a Boy Commandos on that same world, the tales most known are of the Commandos on Earth-Two who battled alongside that world's heroes such as Sandman, Sandy and the Guardian.
Each had a Frenchman named Andre, a Texan in Chuck and Tex, Europeans in Olaf and Alfy, wise members in Hendrickson and Percy, as well as team nicknamed mascots in Chop-Chop and Brooklyn. The chronicles tales of Esrth-Two's Commandos balance out those of Earth-One's Sea Devils...who themselves has far more adventures than their own Earth-Two dopplangerw in the Junior Justice Society.